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France said she and her 4-month-old son, Owen, waited almost two hours inside the aircraft and that it took 30 minutes to get off the plane after she requested an ambulance.

“They were not equipped to handle it,” she said. “They couldn’t evacuate us. It was chaos. I really thought my son was going to die in my arms.”

France told the paper that the plane was hot when she boarded. She used wet wipes on Owen's neck to try and cool him, while flight attendants brought ice in bags.

She was allowed to leave the aircraft for 20 minutes, but was asked to return for takeoff.

Temperatures still sweltering, her baby's condition declined.

“His whole body flashed red and his eyes rolled back in his head and he was screaming,” France said. “And then he went limp in my arms. It was the worst moment of my life."

The mother begged for an ambulance, and after some debate, the aircraft returned to the gate.

Owen was hospitalized and released the same day. Doctors told France he has no underlying medical condition, but was suffering from the heat.

United Airlines sent a statement to the Denver Post, reading: “Yesterday, a child onboard flight 4644 at Denver International Airport experienced a medical issue while the aircraft was taxiing prior to takeoff. The pilot returned to the gate as our crew called for paramedics to meet the aircraft. Our thoughts are with the child and family, and we have been in contact to offer travel assistance.”

"This should never have happened," the statement read." We are profoundly sorry to our customer and her child for the experience they endured. We are actively looking into what happened to prevent this from occurring again."

The airline has recently been plagued by public relations nightmares, from a man being dragged off an overbooked flight to a giant rabbit dying in transit.